<template>
  <div :class="['upload-file']">
    <el-dialog title="pdf预览" :visible.sync="showPdf" width="80%">
      <iframe
        :src="'/pdf/web/viewer.html?file=' + pdfUrl"
        frameborder="1"
        height="800"
        width="100%"
        style="margin-top: 0.25rem;"
      ></iframe>
    </el-dialog>
    <el-upload
      :action="uploadFileUrl"
      :before-upload="handleBeforeUpload"
      :file-list="fileList"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      :on-success="handleUploadSuccess"
      :show-file-list="false"
      :headers="headers"
      class="upload-file-uploader"
      ref="upload"
    >
      <!-- 上传按钮 -->
      <el-button size="mini" type="primary">选取文件</el-button>
      <!-- 上传提示 -->
      <div class="el-upload__tip" slot="tip" v-if="showTip">
        请上传
        <template v-if="fileSize">
          大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
        </template>
        <template v-if="fileType">
          格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
        </template>
        的文件
      </div>
    </el-upload>

    <!-- 文件列表 -->
    <!-- <transition-group
      class="upload-file-list el-upload-list el-upload-list--text"
      name="el-fade-in-linear"
      tag="ul"
    >

    </transition-group> -->
    <ul class="upload-file-list el-upload-list el-upload-list--text">
      <li
        class="el-upload-list__item ele-upload-list__item-content"
        v-for="(file, index) in fileList"
        :key="file.uid"
      >
        <el-link
          :href="`${baseUrl}/file/${file.url}`"
          :underline="false"
          target="_blank"
        >
          <span class="el-icon-document"> {{ getFileName(file.name) }} </span>
        </el-link>
        <div class="ele-upload-list__item-content-action">
          <el-link
            v-show="showPreivewBtn(file.url) === 1"
            :underline="false"
            @click="previewFile(`${file.url}`)"
            type="primary"
          >
            预览
          </el-link>

          <el-link
            v-show="showPreivewBtn(file.url) === 2"
            :underline="false"
            @click="previewPDFFile(`${file.url}`)"
            type="primary"
          >
            预览
          </el-link>

          <el-link :underline="false" @click="handleDelete(index)" type="danger"
            >删除</el-link
          >
        </div>
      </li>
    </ul>
  </div>
</template>

<script>
import { getToken } from "@/utils/auth";

export default {
  name: "FileUpload",
  props: {
    // 值
    value: [String, Object, Array],
    // 数量限制
    limit: {
      type: Number,
      default: 5
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 5
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ["doc", "xls", "ppt", "txt", "pdf"]
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true
    }
  },
  data() {
    return {
      baseUrl: process.env.VUE_APP_BASE_API,
      uploadFileUrl: process.env.VUE_APP_BASE_API + "/system/upload", // 上传的图片服务器地址
      headers: {
        Authorization: "Bearer " + getToken()
      },
      fileList: [],
      fileSourceName: "",
      wordWebShowList: ["doc", "docx", "xls", "xlsx", "ppt", "pptx"],
      showPdf: false,
      pdfUrl: ""
    };
  },

  watch: {
    value: {
      handler(val,oldval) {
        if (val) {
          let temp = 1;
          // 首先将值转为数组
          const list = Array.isArray(val) ? val : this.value.split(",");
          // 然后将数组转为对象数组
          this.fileList = list.map(item => {
            // if (typeof item === "string") {
            //   item = { name: item.name, url: item.url };
            // }
            item = { name: item.name, url: item.url };
            item.uid = item.uid || new Date().getTime() + temp++;
            return item;
          });
          this.$emit("input", this.listToString(this.fileList), this.listToStringFileName(this.fileList),this.fileList);
        } else {
          this.fileList = [];
          return [];
        }
      },
      deep: true,
      immediate: true
    },
    fileList(v) {
      this.$emit("input", this.listToString(v), this.listToStringFileName(v),v);
    }
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize);
    },
    showPreivewBtn() {
      return url => {
        let suffixName = url.slice(url.lastIndexOf(".") + 1);
        let isCanWordShow = this.wordWebShowList.includes(suffixName);
        if (isCanWordShow) {
          return 1;
        }
        if (suffixName === "pdf") {
          return 2;
        }
        return false;
      };
    }
  },
  methods: {
    getFileSourceName() {
      return this.fileSourceName;
    },

    // 上传前校检格式和大小
    handleBeforeUpload(file) {
      this.$emit("getSourceFileName", file.name);

      // 校检文件类型
      if (this.fileType) {
        let fileExtension = "";
        if (file.name.lastIndexOf(".") > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
        }
        const isTypeOk = this.fileType.some(type => {
          if (file.type.indexOf(type) > -1) return true;
          if (fileExtension && fileExtension.indexOf(type) > -1) return true;
          return false;
        });
        if (!isTypeOk) {
          this.$message.error(
            `文件格式不正确, 请上传${this.fileType.join("/")}格式文件!`
          );
          return false;
        }
      }
      // 校检文件大小
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize;
        if (!isLt) {
          this.$message.error(`上传文件大小不能超过 ${this.fileSize} MB!`);
          return false;
        }
      }
      return true;
    },
    // 文件个数超出
    handleExceed() {
      this.$message.error(`上传文件数量不能超过 ${this.limit} 个!`);
    },
    // 上传失败
    handleUploadError(err) {
      this.$message.error("上传失败, 请重试");
    },
    // 上传成功回调
    handleUploadSuccess(res, file) {
      this.$message.success("上传成功");
      res = res.data;
      this.fileList.push({ name: res.fileName, url: res.pathName });
      this.$emit(
        "input",
        this.listToString(this.fileList),
        this.listToStringFileName(this.fileList)
      );
    },
    viewFile(url) {
      let showIndex = this.showPreivewBtn(url);
      console.log("showIndex");
      console.log(showIndex);
      // word 网站展示文件
      if (showIndex === 1) {
        this.previewFile(url);
        return;
      }
      this.$message({
        type: "error",
        message: "该文件展示不支持预览"
      });
    },
    // word 网站 预览文件
    previewFile(url) {
      let fileUrl = "http://39.96.64.65:9998/" + url;
      let previewUrl = fileUrl + "&fullfilename=" + url; // 预览路径名
      previewUrl = this.base64.encode(fileUrl); // 转码

      window.open(
        "http://47.96.8.181:8012/onlinePreview?url=" +
        encodeURIComponent(previewUrl)
      );
      // let domainLocation = window.location.host || "http://jxdjs.thinkervc.cn";
      // // let domainLocation = "http://jxdjs.thinkervc.cn";
      // let activeUrl = domainLocation + url;
      // window.open(
      //   "https://view.officeapps.live.com/op/view.aspx?src=" + activeUrl
      // );
    },
    previewPDFFile(url) {
      // let domainLocation = window.location.host || "http://jxdjs.thinkervc.cn";
      this.pdfUrl =
        "http://" +
        window.location.host +
        process.env.VUE_APP_BASE_API +
        "/file/" +
        url;
      this.showPdf = true;
    },
    // 删除文件
    handleDelete(index) {
      this.fileList.splice(index, 1);
      this.$emit(
        "input",
        this.listToString(this.fileList),
        this.listToStringFileName(this.fileList)
      );
    },
    // 获取文件名称
    getFileName(name) {
      return name;
      // if (name.lastIndexOf("/") > -1) {
      //   return name.slice(name.lastIndexOf("/") + 1).toLowerCase();
      // } else {
      //   return name;
      // }
    },
    // 对象转成指定字符串分隔
    listToString(list, separator) {
      let strs = "";
      separator = separator || ",";
      for (let i in list) {
        strs += list[i].url + separator;
      }
      return strs != "" ? strs.substr(0, strs.length - 1) : "";
    },
    // 对象转成指定字符串分隔
    listToStringFileName(list, separator) {
      let strs = "";
      separator = separator || ",";
      for (let i in list) {
        strs += list[i].name + separator;
      }
      return strs != "" ? strs.substr(0, strs.length - 1) : "";
    }
  }
};
</script>

<style scoped lang="scss">
.upload-file-uploader {
  margin: 5px 0;
}
.upload-file-list .el-upload-list__item {
  border: 1px solid #e4e7ed;
  line-height: 2;
  margin: 5px 0;
  position: relative;
}
.upload-file-list .ele-upload-list__item-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: inherit;
}
.ele-upload-list__item-content-action .el-link {
  margin-right: 10px;
}
.error-box{
  border-bottom: 1px solid red;
}
</style>
